IDictionary.Keys 屬性

定義

命名空間:

System.Collections

組件:

System.Runtime.dll

取得 ICollection 物件，其中包含 IDictionary 物件的索引鍵。

public:
 property System::Collections::ICollection ^ Keys { System::Collections::ICollection ^ get(); };

public System.Collections.ICollection Keys { get; }

member this.Keys : System.Collections.ICollection

Public ReadOnly Property Keys As ICollection

屬性值

ICollection

ICollection 物件，其中包含 IDictionary 物件的索引鍵。

範例

下列程式代碼範例示範如何實作 Keys 屬性。 此程式代碼範例是針對 類別提供的較大範例的 IDictionary 一部分。

public:
    virtual property ICollection^ Keys
    {
        ICollection^ get()
        {
            // Return an array where each item is a key.
            array<Object^>^ keys = gcnew array<Object^>(itemsInUse);
            for (int i = 0; i < itemsInUse; i++)
            {
                keys[i] = items[i]->Key;
            }
            return keys;
        }
    }

public ICollection Keys
{
    get
    {
        // Return an array where each item is a key.
        Object[] keys = new Object[ItemsInUse];
        for (Int32 n = 0; n < ItemsInUse; n++)
            keys[n] = items[n].Key;
        return keys;
    }
}

Public ReadOnly Property Keys() As ICollection Implements IDictionary.Keys
    Get

        ' Return an array where each item is a key.
        ' Note: Declaring keyArray() to have a size of ItemsInUse - 1
        '       ensures that the array is properly sized, in VB.NET
        '       declaring an array of size N creates an array with
        '       0 through N elements, including N, as opposed to N - 1
        '       which is the default behavior in C# and C++.
        Dim keyArray() As Object = New Object(ItemsInUse - 1) {}
        Dim n As Integer
        For n = 0 To ItemsInUse - 1
            keyArray(n) = items(n).Key
        Next n

        Return keyArray
    End Get
End Property

備註

未指定傳ICollection回之物件中的索引鍵順序，但保證與 屬性所Values傳回的 ICollection 對應值的順序相同。

另請參閱

• ICollection